Pressure regulating valve



May 17, 1932. F. c. BELL 1,858,612

PRESSURE REGULATNG VALVE 7 Fied Deo. 20, 1927 1&5' 5.1. 35

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A TTORNEYS.

Patented May 17, 1932 Unirse stares FRED C. BELL, OF ALALIEDA, CALIFORNIA, ASSIG'NOR TO THYLE- MACHINERY COMPANY OF SAN FRANCISCO, CALIFORNIA, .A CORPORATON OF CALIFORNIA Perser carica PRESSURE RIEGULATING VALVE Application filed December 20, 1927. Serial No. 241,314.

This invention relates 'to pressure regulate ingvalves and especially to a type of valve which is designed to handle heavy pulps, semi-solids and the like.

The object of the'present invention is to generally improve and simplify the construction and operation of valves of the character described; to provide a valve which is entirely automatic in operation and which will maintain a uniform predetermined reduced pressure in the discharge side ot the valve; to provide a valve which may be quickly and readily adjusted to vary the pressure required; and further, to provide a valve which is particularly adapted to handle thick or heavy pulps, slurry materials, semi-solids and the like. The valve is shown by way of illustration in the acccmpanying drawings in which:

Fig. l is a plan view of the valve, said view being partly broken away and being shown partly in section,

Fig. 2 is a central vertical longitudinal sect-ion of the valve.

l Referring to the drawings in detail, A indicates in general a valve housing which in this instance is provided with an inlet connection 2 and a discharge connection 3. The housing consists of a bottom section 4, a top section 5 and a connecting side wall 6. Formed integral with the top and bottom walls 4 and 5 is a cylindrical section 7 in which is formed a plurality o superposed ports, such as indicated at 8 and 9. The cylindrical section is formed in alignment with the discharge connection 3 and the ports formed in the cylindrical section form communication between the inlet and dischargeconnections, as indicated. Slidably mounted within the cylindrical section is a sleeve valve consisting instance rubber. The diaphragm is U-shaped in cross section as shown in Fig. v2, the lower section thereof being bolted or similarly secured to the upper part of the housing 5, as indicated at 1'?, and the upper section 'thereof being secured to the cover member 16. A flexible sealed connection is thus formed between the cover and the opening114. The valve proper is provided with a stem 18. This stemvis threaded substantially from endr to end and it extends through the cover 16, the upper end of the stein terminating in a square end 19 so that it may be grasped by awrench or like tool when it is desired to adjust the sleeve valve with relation to the cover and the bolts 8 and 9, i. e., a threaded connection is formed between the stem and the cover so that such adjustment may be obtained. Formed on the upper section 5 near the inlet connection 2 is a bearing lug 20. Pivotally attached thereto is a pair of links 21 and piv- `otally attached to the upper ends of the links as at 22 is a lever 23, on the outer end of which is mounted anl adjustable weight 24'. The end of the lever adjacent the pivotal connection 22 is enlargedv to :to-rm a ringshaped section 25 to permit the valve stem 18 to extend therethrough. The opposite sides of the ring are provided with rocker points 26 and these engage rocker bearings 27 formed on'the cover section 16. Upward movement of the lever is limited by a cross bar 28 which is supported lby end posts 29. This bar is provided with a fork-shaped downwardly extending portion 30 which forms a guide for the lever. s

In order to describe the operation of the valve, it may be supposed that the inlet connection 2 is connected with a settling tank and that the hydrostatic head of the tank approximates lifty pounds to the square inch, and further that the discharge side 3 of the valve is connected to the suction side of the slurry pump or the like. In such an installation it is desirable to maintain a continuous predetermined pressure on'the suc-` tion side of the pump and in this instance, it may be stated that the pressure approximates about six pounds to the square inch Under these conditions, the weight 24 is adjusted-on 'as I Having thus described my invention, what the arm 23 until it reaches a point where the iniiowing material will create sufficient pressure to raise the lever and with it the valve when a pressure in excess of six pounds is encountered, i. e., the materialfrom the settling tank enters the inlet connection 2 and passes-through the ports 8 and 9 into the interior chamber of the valve formed by the cylindrical section 7. It completely fills this chamber and as such discharges through the connection 3. At the same time, it is entering under pressure, it will exert an upward pressure on the cover member 3 and will' tend to raise the same and simultaneously the valve, as this is connected to the cover section by means of the threaded 'stem 18. The

entrance of an excess of material consequently builds up the pressure suiiicient to raise the lever in the valve and upward movement of they valve thus takes place which brings the ring-shaped sections 10 and 11 into register with the ports 8 and 9, thus cutting off or diminishing the flow and thereby maintaining acconstant discharge and a uniform pressure. The amount of pressure required can, of course, be changed at any ytime whether the valve is in operation or not by merely sliding the Weight 24 inwardly or outwardly on the lever 23 as the case may be. By referring to Fig. 1, it will be noted that material entering through the connection 2 will completely surround the inner cylindrical section 7, as the valve housing is enlarged to form an annular surrounding passage, such as indicated at 35. The ports 8 and 9 communicate with this annular passage and ample space is thus provided for a large and liberal flow, this being of particular importance where heavy pulps, slurry solutions, semi-solids and like materials are being handled. Where the viscosity or thickness of the pulp varies, it is also possible to increase or decreasetlie flow by raising or lowering the valvev with relation to the cover section, this being accomplished by merely loosening a locking nut 36 and then rotating the valve stem through the upper squared connection 19 so as to raise or lower the valve with relation to the ports 8 and 9. i

' The whole valve structure is exceeding-ly simple and compact. It is quickly and read- .ily` adjusted for varying flows and as a hand hope plate 37 is provided at the forward end, it maybe readily opened for inspection, adjustment and repairing.

' While certain features of the present invention are more or less specifically described, I wish it understood that various changes may be resorted to within the scope of the appended claims. Similarly, that the materials and linishes of the several parts employed may be such as the manufacturer may decide `or varying conditions or uses may demand.V

I claim and desire to secure by Letters Patent is 1. In a device of the character described, the combination with a cylinder and a valve slidably mounted therein, of an annular flexible diaphragm secured to one end of the cylinder, a pressure plate secured'to the diaphragm forming a closure for one end of the p cylinder, a lever extending across the pressure plate and engageable therewith, said lever being pivotally attached to the c linder at one side of the pressure plate and aving an adjustable weight on its opposite end to exert a predetermined pressure on the pressure plate, a stem connected with the valve and extending through the pressure ible diaphragm secured to one end of the cylinder, a. pressure Aplate secured to the diaphragm forming a closure for one end of the cylinder, a lever extending across theV pressure plate and engageable therewith, said lever being pivotally attached to the cylinder at one side ofthe pressure plate and Vhaving an adjustable weight on its opposite end -to exert a predetermined pressure on the pres-cA sure plate, a stem connected to the valve and extending through thepressure plate and the lever, a threaded connection between the pressure plate and the stem, and means on the upper end of the stem for rotating the same to raise or lower the valve with relation to the pressure plate andk withoutdisturbing the pressure regulating lever.

3. In a. device of the character described, the combination with-a ported cylinder and the valve slidably mounted therein, of an annular flexible diaphragm secured at one end of the cylinder, a rigid pressure plate secured to the diaphragm forming a closure for one'end of the cylinder and having a threaded opening therein, an adjustablepressure regulator connected with the pressure plate and adapted to exert a predetermined pressure thereon, a threaded stem connected to the valve and extending through said threaded opening in the pressure plate and the pressure regulating means, said stem having a squared end engageable for rotation at a point above the pressure plateand the 'pres'-` sure regulating means to raise or lower the valve with relation to the pressure'plate and without disturbing the pressure regulating means, and a nut on said stem engageable with the top of the pressure plate to prevent rotation of the stem.

FRED o.Y BELL.

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